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FINANCIAL INSTRUMENTS - Gain (Loss) on Non-Hedge Derivatives and Warrants (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Gain (loss) on non-hedge items $ 2.6 $ (1.8)
Warrants and other 0.1 (0.7)
Gains (losses) on non-hedge derivatives and warrants (13.9) (31.8)
Embedded derivative    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Gain (loss) on non-hedge items (6.9) (7.8)
Embedded derivative | Rosebel Gold Mines N.V.    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Gain (loss) on non-hedge items (5.9) (23.3)
TARF    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Gain (loss) on non-hedge items (3.0) 0.0
Extendible forward arrangement    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Gain (loss) on non-hedge items $ 1.8 $ 0.0